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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53152f1c05c9e87e11458d560ca31370d8e6015acfdf3e4900bbf2ffeddc97a8' 
  AND token = 'Ifi3aPs91UTKUGmotffi5WiLQWwHy/0BA8v8MA4dTiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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