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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7042b0e513038a1edd2673a9b8637f5e50aeb9ba52ca226f707bb6369f870ef' 
  AND token = 'Ol6CQAfyF2lyfXwpe3EemAJk8t/VDOCyspzhf8Uffio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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