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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8f2d3886efb1cf99ae5d40af856af98e1fa74799ef9f1ce0249e3cd87fc5b8e' 
  AND token = 'VLOTjAWjk2rUoZiDWawRVjPEEXAOS2QwVNS6Equalto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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