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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6735cdd0b0acb18fd5a0cf7927626f994eebd05bd86fc3545b0a64773c85ae8d' 
  AND token = '9JonFV+qoSWUX+Q2uID9qgmVynVXEo4Vxd28IU8T5wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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