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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a6ea3e2543c1c298225df4adf01519425ed0dedc11628b2feacd12d0677ba08' 
  AND token = 'eVfyLGPJBzciGLk2UB6yBrOVXAGv+NNKnnU/qLPa83E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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