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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec4abd5424511b1365481fa204a5f7a968cf878b96528b71c2c9033e95c5167a' 
  AND token = '7LW+xnYuThPLkk9jaex8YT9F4VpjqXecCXG67aadWnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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