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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e31060498ffdb77f54ddc90e5b1c6e58373ba133e1f43423c6320255abf235a' 
  AND token = 'bcmSWs+ZpGFQBk7/1T+LfOg7DQsFkUc950uBTZs7Xc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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