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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3696b037ade15e29d2d0af0a0d02f23092ba6b5f0dd589b8beec3ca154df41b' 
  AND token = 'xQUAR0vFVt3yNnq7mcMCBZoWj6WyD7aNgE1Tx1Qr5t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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