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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd24a365dc349674562379b2b1da6d80abb5d795933e6be85aa22df6f11633186' 
  AND token = 'cuO0kVzopyMzgLOp5W1EN1JcDA7pnFfoUpGKi7V8YlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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