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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd019d14f6ce0690919669f5ec24c8b65099ce3bc35b4470de5d4bbe66810951c' 
  AND token = 'BJXxoBJ5HR2bv9JGySYt8qjLEXu5siihf1bmr3Va/Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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