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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41596897c9b2a06529a6c00f9e4a29bfe78c2fcf54b769317db5cbe05fdd7dd6' 
  AND token = 'LCmTw0WLHene3KSRwcadfm+eTfbNMQOyXDJgOCQOpT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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