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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36889bdcc3a41a2d6bbcd9862ff663b66adaa3aa8799c3bb1a718b254e9815a0' 
  AND token = 'wqATKaKjTYAlF/ruIFoSd/5K5XANEJbyLo4Cx0Me5JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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