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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f510b8e4f5d59473ac495525c77bfba8832290316f8f17a77c0f5ad3549e9e' 
  AND token = 'KRh3xRPa9atEDnA6Tx9vbmptja4OlEGHeXAOOqGPxhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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