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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93eec5e581ecf6ca658eeb470f7a293ffa2b1ae665556c56c200753f35e0634' 
  AND token = 'NTKanZnQcsgql0bTP9pl8Mx3hCzTs/B5x0R/4z/+GNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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