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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04ebc40bec2e9aab7c59aa29c038bef506694f33afea4d4dd9e090de5f7f2c86' 
  AND token = 'I90s58bzxRS4qB07sxya48Asyl2OcluXPOao3EtPG0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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