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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ff2427c7191fa2f5c879fb330c1ef05cc2c8295f80e2395ebf220665c1f19df' 
  AND token = 'bcLQsHTUfYrT22wnmbjClPFal655Y7N79LHS0s9eIow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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