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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51b12e0a332b47a3e24564c374ccd5f036a1e9e11b63cd50b1a386cb0d94e9d5' 
  AND token = 'B9k0WH97En4rFjK2IAOBlQBm8AWLrrORTnODIU3qaKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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