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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '187bbc223ee44b9d2421303cb7934f4a73976c00b487c005c5b2970351b760e2' 
  AND token = 'qTlqsH7NWHCOhfX4Qbqg9z0znzz8y7jwLN5pfw4GQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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