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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf3ef831b2ccf101d140ede629e0b6c64c2340beb70ac012b71a91af212e9ea6' 
  AND token = '4YVed4KDb4y8gri88IbGTlmnEgYubTP1kb1NGzjrDgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}