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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3489164067d6aaef16da02948f07dfaf1326632aaad5ffdb1da34c7d21090c51' 
  AND token = 'PqUC2XRJ3XqSiKUdxfAKZ3+TWTrCu08Zb9+W+cHxipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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