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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44b840184e9f9a9e8295a1f55f82f3437ff1d33e890b6fc3cd76f94e4f783cd5' 
  AND token = 'CPn02fMiLE1PNeC9HNufOKx/NOLlBPtwgN+mtM5uUz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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