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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca73dbe2f2f6375cea83110644970ec9d474cbd8e799e068e4c5f30f254ffc2' 
  AND token = 'q4zCzL+9o3Av0OnXIh1hpN7cQdmwQDEu7OGLZyLdDpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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