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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53a63ad80455668db3ffda5488b5440c865a12e56b8b60aaf56d6868ec0288e4' 
  AND token = 'b3HnS6OT5xdB3k85TtWWllXZ8FQ7ZSHoJqzg+Vyj8OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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