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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f35b857cf0ac47903d12c962f752b5650da814ced6f62233d380e153163b0ff' 
  AND token = 'fhVwEr0/wxp7RWOMI7BcmAGTZfuc9de03rlEJwN8+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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