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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd7ed321d40ff2dcf1aad5c6c6c0558d87a4b31e22a931e1479a4161b389aa44' 
  AND token = 'mLneD8rnPjLaJWvBvUf3I06CmN+8k1ZDSIlzEJjQR1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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