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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fcdf55af7b996446f0e725fdb1a2acc04a77c05d8fc8ab91d1e50ede2c0fdb9' 
  AND token = 'WZfBW1nAPKh1nW3jqN4o+5+znu4NP3CljIe48bcx7WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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