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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6d4cf1cc9591ccdd44689d549b7b8d32dec4ac614b8cb2ba5cec5277932e15e' 
  AND token = '/to9hIFu7b2cNMb7XDohbjxEJlNN8SGkHGCjhmydYfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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