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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2bf0380ef1114c1ca06be94a6d191e3ee8639f378be28441e7e43ef2bbb573b' 
  AND token = 'H1N6cb84N+TnXuz8QaGQ9sS+x+SvitIOn/JURwvv3Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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