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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10ae1f0c8add4fd35eff2b020e3bb1de9a69ddc876293109b2c4e1eaae8028f3' 
  AND token = 'nfZVZTqu0hSyJqYCapCe9FUdgaHfaQMmhF/rN564JQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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