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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e29edacea9c0d957df41e9c35db9cb0902194d65b53978a48392984c7b01e52' 
  AND token = 'Fj2vYrxp4YQaAa/WLUaLY/1knD0HKKEOirgBh3v8Qb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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