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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93895ff4338c0be9c89e09c16077ff31426b51e868cafbf951630ec4e56cac83' 
  AND token = 'kXQaFaNU7FUPFPw99Af9KbKnOypICNgv+2xAVV3zn5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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