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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b103db07c55771dc3fd7156932b1e1813084864e965579effaf3c1d07712142' 
  AND token = 'Hka4PLHtzar9vQG845bPjHbAvdVFRRnQxUx7q/EyPHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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