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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f5f522a1e91f93035ede673df135fad3e74ccab9bf6a6757a2251bf8926d2fc' 
  AND token = 'rd66ech2JbuKst5/qmS+B6zCcwKgA+eyLFrWrkFH/R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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