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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cf1906d968f2f120e35625ef0c5588ae933edf6d2c1d3f1b33e0c63eae4c227' 
  AND token = 'iJQth7xG4ZhHurrAQGPzrTualc/Dw11GIjNaKszIZk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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