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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19ba7ff6e0a0765fdf9e9e7ccbebf209b338e03281571a3cf7b23c3b0a8e3f08' 
  AND token = 'YBPQCT8sHIWMkoFVn6GaIeegrY3nHT3zEuMj0b3ejzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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