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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e89ae6ccd3ec2a37ec9e596f61221d1c0a45b5fba089bb1c1827f0ca95a7498' 
  AND token = 'GtEJTyCLOPRWdtZpJNEO/OlPnRYm64geYm+xx8aDs2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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