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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a209dbe1c770245429a57c62e26916e47a36b11b88719d180e4adcd5b6e74c4c' 
  AND token = 'kFV9wKOO0NciHFzmSy/f3Wl50EtuPDFSuiejGKRgzMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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