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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01c230a1792a333d1fe9c230dd4a0563ad4710a3a8e4a6f88a3b759da7e78f8e' 
  AND token = '+I4F7uUXq1IN0+OxfmsbLUt2BMQ4ZbwsUONfAQlp8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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