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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e746301552cd7e237994d9058480491a5322706d789ca143b4a029b50a608e0' 
  AND token = 'M/Nc4dVd9A0LCBD2egQ8LJEVLP7MSO9nCD/6BUflAkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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