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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af1fe02b9fd2d500aa929bbe05f10f76dfffcc3179c02cd9c38d5db939cc887' 
  AND token = 'yuYx1EPAj7QcsWdpJ2Jba7CH7+f3nGvy84LDbtZcF30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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