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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b848be19c77b78b597dc0cdd94ec83d556bc1bd4deb9ec514294b3c1c8cabc53' 
  AND token = 'fi8aDp83Ots0Zb24MbTMN1TLDwoxv8W4a9qaX5d5GWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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