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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa644abeaa0bb80bad6fce41d1a9f17c2b90a3e306e599450a3711e8441fae52' 
  AND token = 'M4P7YVX6L2rEj1ZHRHDGj0XITwPwppuy3RbbTpEJA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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