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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '068f9a83e2e3a02fa5e2f94e5b7fc73e0eda7e2663f96ec8f05952e5ca48f1b8' 
  AND token = '/3w9jFwyPSUSVPGAScaNX0D9uoGB1AooTFepKFw2z3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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