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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5657722cbcf392d7661fa5040a0f37adcc4ad96045cf0e9701205a3ed9ce03a' 
  AND token = '7Kqi1HCm4WTRI+zpeoSWM3HDCfy6wD4/msKUXSs0GTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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