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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ffbe4545d13150c3fecde293ae238a5546321556d1252787995572ad24eee71' 
  AND token = 'p+xLCScvnmPp3/Naunz5ykpJ0nDO5kYZ1zBz4Isef9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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