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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01028c498f6ed63d6e8ebc99ae259b28837e026d15920aebf8f6d627d9cf6269' 
  AND token = 'LWbzcbysMQ86pVXgBlVghRHxLE7ku7o1VUF8bHII4vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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