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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '642141471d99eb6d81287a1cc1c7d9bae75eb6ea7765d10389bb9c508583c4d7' 
  AND token = '6oN3IVCV0CF09bR79ijYw0E6b774UZAF/9cgDQwMwgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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