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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff878616f0d3a903693bd87db2837f6bbc4e8eaf9325ac864de18a5a7f5f2daa' 
  AND token = 'tVfTKAuTPw6Vl5fO2Eb1QNjSUpaR4kwHieeFHUB/LIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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