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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e4f0142ea790436d670e1489b5b07a71872fea6d42ddd14ac170e89eeb122b0' 
  AND token = 'aMcBH9MTnNXUkrwI3YrX/4Skdv4+Yv0Ub/CYuS+FIjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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