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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7e3fd231ace3b58c718887a0d7f991c63c538b9cbd5aec67e217253976fe7e' 
  AND token = 'LBDvHF5My9rlziXYVwYD3YP5zotkf2bxu/QUt4/oyzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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