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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7fda82b8c73fd9cc48f6cf41b98a2e9bea86d8465fef838e06e9937a34f1125' 
  AND token = 'q4fiV9Iw2neHOVCkIrbD/o3jvC0q/NGvGNcuhTAdUjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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