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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd55e96d05940a35a3fa04d0ad1ad1ff3084b41c30dec6b563253c48d5d4f366' 
  AND token = 'Hlx7nzt/Vit0VdHMD3lNaU8u69CDCPNslY6EGardev0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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