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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec7a93edfbabcad33700f0cfa1e29fe481b626d2812f6464ab66007405b2ea13' 
  AND token = 'zu2aj+WSREmpaSGZRlZQa7uAuAM5jVwsu9Rgp/eDUKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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