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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d18a41b055b3e59d2dfc00e3b0265e6b55263d44666ee012a56ebd2513629a9' 
  AND token = 'sgKTPcEbF8gNiRq0tE3BoeUV0HKvoYkwdZ5gAXM07uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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