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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c1f4479f4aea21010b0e31263828ac3899191b1c4c14a49404b69f48815b12a' 
  AND token = 'UkDfJXtyYl5Hpdic0uK2dKFMMt3fwAwHTIbmIdSoPSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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