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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1064a783e4b28dfd2828f06c5f77934b9b36617eeb49b684bb58c76b995271d4' 
  AND token = '3yidCpW693EHbldwunAabjarJTEMYCdhlXUNEGwRpRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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