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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e183bc91885bb47f9871f014189a8741aed10e6a8f5245499f5ea49024360b7' 
  AND token = 'JLrc0RcnSAb86eZ66vDusmivui0ce/L7UYgY/kIg0+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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