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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb0f270ef6e570a71b26d19f4a3f0f84238452fc9160103f1f5e0d688be5f2e5' 
  AND token = 'RlSIHKgdqjOkD3ZVmttPTpy9s0s14PD9g3U8n1MYdBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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