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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab37180a8582aa8e1c8b2fa274c64637a9af90ac8007e0c8fef8e80b999cf752' 
  AND token = '1wEaH1SWVWAWkUFYtmTUalWpiZWxSXGFC4UVGT72bq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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