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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d498b6fa121989bdcdd8c7257850dfdc1178458513192a0cc329857d8d5c7b' 
  AND token = 'MDC9I1Wi7oxjC+geTaWF1q3wr5OVBICTX02HG+lW0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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