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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0c076cf6aa3725598f311d1c4a64d8a4af408454f36bbcfd1b15c54b7cfd8d1' 
  AND token = 'oVJ1Yt28lnYQsJ8hD1aMV9r+ocx9tlsm1RbGXk6JNfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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