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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb8d285afa99670d3c2e67b9101cee63e2bc2315b45a7569de83d6c1457bfdcc' 
  AND token = '79gTLp1Abo+DsMCjjNy1t+6Qpl3F7bB201LX6EsyxwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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