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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38f30d93ff04bf53af3ec1ccbae1b9262b23281220dd9a5f73ffdda863802aa5' 
  AND token = 'OpQbjDv7WBukKHD62QIHMt28ZEaLa//rGCpW2zcaC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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