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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da7ae59a304ba9f5af4f6b8c5b6330b160ceae39aa4326aebc37a8eccc4f4f05' 
  AND token = 'rHdeITsWysCZ/pAif1bN4S/7SqDDwRsDci2PgPCZYQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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